How to generate OpenAPI 3 specification docs with springdoc-OpenAPI?

To have springdoc-openapi automatically generate the OpenAPI 3 specification docs for our API, we simply add the springdoc-openapi-ui dependency to our pom.xml: Then when we run our application, the OpenAPI descriptions will be available at the path /v3/api-docs by default: To use a custom path, we can indicate in the application.properties file:

How to configure OpenAPI documentation for REST API in Maven?

Step-1: Let’s start by adding OpenAPI 3.0 maven dependency to our pom.xml Step-2: Enable openapi documentation by adding @OpenAPIDefinition on the main class as below. With steps 1 and 2 we configured OpenAPI 3.0 default documentation for Rest API’s at default URI as below

How do I use openapi3 with Java?

You can use it in runtime mode or as a maven plugin. There is also OpenAPI3 to java client generator, which generates the model. Again it generates also Javax annotations and Jackson annotations for correct inheritance.

How to generate OpenAPI 3.0 YAML file from existing Spring REST API?

Q: What is the OpenAPI Generator?

1. Overview As the name suggests, the OpenAPI Generator generates code from an OpenAPI specification. It can create code for client libraries, server stubs, documentation and configuration. It supports various languages and frameworks. Notably, there's support for C++, C#, Java, PHP, Python, Ruby, Scala — almost all the widely used ones.

People also ask

Does OpenAPI generate code?

As the name suggests, the OpenAPI Generator generates code from an OpenAPI specification. It can create code for client libraries, server stubs, documentation and configuration. It supports various languages and frameworks.

Is OpenAPI the same as Swagger?

OpenAPI and Swagger used to refer to the same thing. While there are differences today (OpenAPI refers to RESTful API design and Swagger refers to a set of SmartBear tools), this blog will use the terms interchangeably. If you develop software today, chances are you are developing web APIs as well.

I have an existing Spring REST API for which I want to generate the OpenAPI 3.0 YAML file and not Swagger 2.0 JSON/YAML?

Since as of now, SpringFox does not support YAML generation. It generates JSON with Swagger 2.0 (which follows OPEN API 3.0 spec).

Also, there is https://github.com/openapi-tools/swagger-maven-plugin but it does not seem to support Spring Rest.

I tried the Kongchen spring-maven-plugin which is able to generate the YAML file but with Swagger 2.0 definition and not OPEN API 3.0 like :

swagger: "2.0"
info:
  description: "Test rest project"
  version: "1.0"
  title: "Some desc"
  termsOfService: "http://swagger.io/terms/"
  contact:
    name: "Rest Support"
    url: "http://www.swagger.io/support"
    email: "[email protected]"
  license:
    name: "Apache 2.0"
    url: "http://www.apache.org/licenses/LICENSE-2.0.html"
host: "example.com"
basePath: "/api/"

So my question is how can I generate the OPEN API YAML file like :

openapi: 3.0.0
info:
  description: Some desc
  version: "1.0"
  title: Test rest project
  termsOfService: http://swagger.io/terms/
  contact:
    name: Rest Support
    url: http://www.swagger.io/support
    email: [email protected]
  license:
    name: Apache 2.0
    url: http://www.apache.org/licenses/LICENSE-2.0.html

I am currently using swagger-maven-plugin to generate YAML file with Swagger 2.0 definition and converting it to Open API 3.0 definition using swagger2openapi at https://mermade.org.uk/openapi-converter

Question 1:
Can spring-maven-plugin capture io.swagger.v3.oas.annotations to generate the YAML ?

Question 2:
What is the best way to generate the YAML with OPEN API definitions in a Spring MVC Project?

Question 3:
Can io.swagger.v3.oas be used with Spring projects or it is only for JAX-RS projects?

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